Bone Abstracts

Angiogenesis and osteogenesis are tightly linked and dependent on each other. Lipocalin 2 (LCN2) is a mechanoresponding adipokine, strongly upregulated in osteogenic cells subjected to microgravity (0.08–0.008 g), in which it impairs osteogenesis and upregulates the osteoclastogenic cytokine, RANKL. We investigated the role of LCN2 in the crosstalk between angiogenesis and osteogenesis in simulated microgravity conditions as a model of mechanical unloading. Mouse and huma...

The aim of the study was to evaluate relationships between morphometric, densitometric and mechanical properties of tibiotarsus in ostriches (Struthio camelus). 14-month-old males (N=15) and females (N=31) were slaughter to obtain left tibiotarsus. Using computed tomography technique (Somatom Emotion scaner, Siemens), volumetric bone mineral density (vBMD) of the trabecular (Td) and cortical bone (Cd), mean voulmetric bone mineral density (MvBMD) and...

Mast cells (MCs) are pro-inflammatory sensor and effector cells of the immune system. MCs seem to play a role in bone metabolism, because patients with systemic mastocytosis develop osteoporosis. MCs are present in the fracture callus during bone healing, however, their function has not yet been investigated. Here, we examined the role of MCs in the inflammatory and repair phase during fracture healing.Male 12-week old MC deficient mice (Mcpt5-Cre R-DTA)...

Interleukin-6 (IL-6) plays an important role in bone metabolism and regulates fracture healing in a presently unknown process. In the fracture callus IL-6 expression is biphasic; it peaks during the inflammatory phase and again during intramembranous and endochondral ossification (Ai-Aql et al. 2008). Few studies using IL-6 knockout mice indicate that IL-6 might be crucial for bone healing (Yang et al. 2007). However, a generalized IL-6 knockout induces multi...

We have previously shown that female neuronal nitric oxide synthase knockout (nNOS KO) mice have increased trabecular bone volume. However, this study was performed in mice at 10 weeks of age only. To investigate whether the high bone volume is maintained during ageing, we compared 3-month- and 12-month-old wild type (WT) and nNOS KO mice using μCT. The tibias from 8 WT and 8 nNOS KO mice at each age were dissected, fixed for 24 h in buffered formalin, stored in 70% ethan...

: Osteonecrosis of the jaws (ONJ) is a relatively new adverse effect associated with bisphosphonate therapy, but no causal association has been established. By definition, a patient is considered to suffer from ONJ if he has current or previous treatment with a bisphosphonate, exposed bone in the maxillofacial region that has persisted for more than 8 weeks and no history of radiation therapy to the jaws. It has been proposed that ONJ could be linked with impaired topical immu...

The aim of the study was to evaluate effects of 6-month-long administration with nanopartical calcium on morphological and densitometric properties of axial skeleton in pigs subjected to osteoporosis induction with dexamethasone. Male newborn piglets (N=28) were divided after birth into four equal groups (control group receiving placebo, Dex group receiving dexamethasone, NanoCa group receiving orally nanopartical calcium and NanoCa/Dex group) receiving simultaneously...

The aim of this study was to determine morphological and densitometric parameters of mandible obtained from male and female silver foxes (Vulpes vulpes). The study was performed on 1-year-old males (n=7) and females (n=8). Mandible was isolated and subjected to morphological and densitometric analysis using quantitative computed tomography (QCT) method and Somatom Emotion Siemens apparatus (Siemens, Erlangen, Germany) equipped with Somaris/5 VB10B so...

Recent studies suggest the link between low vitamin D levels and the prevalence of cardiovascular disease, diabetes, hypertension and a number of different types of cancer. Nowadays, vitamin D deficiency is recognized as a pandemic health problem and pediatric cancer patients may be even at higher risk than the healthy children. Children suffered from malignancy are especially exposed to its deficiency, because of the potential impact of the disease and its treatment. However,...

Background: Mutations in SATB2 have been described in association with a unique phenotype known as SATB2-associated syndrome (SAS). This condition is characterised by severe intellectual disability affecting speech development, behaviour, facial features and dental anomalies. Skeletal features and osteoporosis have been reported in older individuals (aged 15–36), in association with point mutations. We report a 24-year-old man with a SATB2 misse...